Question

hw to solve integral of sin3xcos5x???

Answer 1

integration by parts

Answer 2

by parts??? by taking whiich one???

Answer 3

is it sincubex or sin3x

Answer 4

by parts??? by taking whiich one???

Answer 5

let u???

Answer 6

take any answer wud b same

Answer 7

but better take u to b sin3x

Answer 8

sin3x(-5sin5x)+cos5x(3cos3x)

Answer 9

use sin(a)cos(b)=(1/2)*[sin(a+b)+sin(a-b)]
=>sin(3x)cos(5x)=(1/2)*[sin(8x)-sin(2x)] which is easy to integrate

Answer 10

u just need to expand above

Answer 11

ghass1978, by using half angle???

Answer 12

sin(a+b)=sin(a)cos(b)+sin(b)cos(a)
and
sin(a-b)=sin(a)cos(b)-sin(b)cos(a)
then
sin(a+b)+sin(a-b)=2sin(a)cos(b)
so
sin(a)cos(b)=(1/2)*[sin(a+b)+sin(a-b)]

Answer 13

tq 4 helping me.... ^_^